Why do many Christians oppose the evolution theory?

A question from an atheist here. Many Christians seem to oppose Darwin's evolution theory and specifically the notion that man evolved from apes. You see this in the press, you see this in politics, I also happened to talk with some devoted Christians who consider this idea heresy. Why is that? I understand it is written in the Bible that God created humans. It isn't written, how exactly. What's wrong with the concept that God created the Universe in a way that 13.7 billion years later, the evolution of living species on Earth produced humans? It would have certainly been a huge job, worthy of God, much more grand than creating humans directly? The seemingly random evolution still follows the laws of nature (specified by God) and produces results (that God intended) - what's wrong with this view? The fact that something seems random to us (and even our science can prove it's random) doesn't mean it is random to God, who is not subject to our laws of nature. So why do many Christian oppose the evolution theory?